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Free local audio converter — no uploads

M4A to WAV Converter — Free, Local, No Upload

The short answer: M4A files carry AAC audio, and plenty of professional tools still want plain PCM. Converting M4A to WAV decodes the AAC and stores the result as uncompressed 16-bit PCM, so DAWs, samplers, video editors, and broadcast workflows that demand WAV input can read it directly. The file grows several times larger; the win is workflow compatibility.

How to convert M4A to WAV

Convert M4A to WAV now

The button opens the Audio Converter with M4A → WAV preselected — it runs entirely in your browser and nothing is uploaded.

Open Audio Converter

Local in your browser — nothing is uploaded

  1. Open the converter

    The button above opens the Audio Converter with the WAV output already selected.

  2. Drop your M4A file

    Add the file (up to 200.0 MiB); the format is verified from its signature, not its name.

  3. Convert and download

    Press Convert; the ffmpeg audio engine (~31 MB) downloads on first use, then your file transcodes in a dedicated worker. Cancel stops the run cleanly.

Conversion facts

Input format
M4A
Output format
WAV
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossless — bitrate tiers ignored
Processing
Local in your browser — nothing is uploaded

M4A

M4A → WAV

What to watch

The container is lossless but the audio is the decoded AAC: the WAV holds exactly what the M4A contained, no better — conversion cannot undo AAC's lossy encode. PCM inflates fast, roughly 10 MB per minute at CD quality, so outputs are capped at 200 MiB (inputs too), with a 5-minute per-run watchdog. Sample rate and channel count pass through as decoded. The ~31 MB conversion engine downloads on first use, then stays cached on your device.

Keep converting

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  • The tool behind this page

    Audio Converter

    Convert MP3, WAV, M4A, OGG and FLAC audio between formats entirely in the browser with ffmpeg.wasm — no uploads. Inputs up to 200 MB with 96/128/192 kbps bitrate tiers for lossy output; OGG uses Opus and WAV/FLAC stay lossless.

Frequently asked questions

Will converting M4A to WAV improve the audio quality?
No — the WAV stores exactly what the AAC decodes to. From that point the file is lossless and safe to edit without further degradation, but it cannot recover detail the AAC encoder discarded. The reason to convert is that editing apps and samplers demand PCM input, and WAV is the most universally accepted PCM container.
Which bitrate should I choose for the WAV?
None — WAV is uncompressed PCM, so the bitrate tier selector stays visible but the encoder ignores it, and the workspace says so. File size is determined by the decoded sample rate, channel count, and duration instead.
Are my audio files uploaded anywhere?
No. Decoding and encoding run in a WebAssembly build of ffmpeg inside your browser tab — the file never leaves your device, nothing is uploaded or stored on a server, and closing the tab discards everything.